Weft-feeder for weaving looms with continuous weft feeding



Nov. 3, 1936.

R. DEWAS .WEFT FEEDER FOR WEAVING LOOMS WITH CONTINUOUS WEFT FEEDING Filed 001;. 17; 1934 PH YMCA/D 25 W45 Mind/a INVE/VTGE K Patented t. a, rose UNITED STATES z, ,lt

WEFT-FEEDER FOR WEAVING LOOMS WITH CONTINUOUS WEFT FEEDING:

Raymond Dewas, Amiens, France Application October 17, 1934, Serial No. 748,657 In France November 10, 1933 1 Claim.

The invention relates to pirnless shuttles and to weft-feeders belonging to the types which are described particularly in the U. S. applications S. Nos. 673,672, 676,251 and 125,885. It deals with the arrangement of the ends of the said shuttles or weft-feeders in accordance with the U. S. application S. No. 695,996, and it has for its object to prevent the floating or nonfloating warp threads from penetrating into the slot which separates. the branches of shuttles, weft-feeders or threadcarriers of the said type.

In the U. S. applications. No. 695,996, several forms of construction have been set forth, of which two amongst others, the second and the third, offer in respect of each of them certain advantages, the combination of which enables the realization of a new form of construction which constitutes in particular the improved weft-feeder forming the object of the invention.

Effectively, the second form of construction described in the said application is characterized by the fact that the groove thereof is arranged obliquely in relation to the middle plane of the shuttle or of the weft-feeder, in such a way that one of its branches has, on the side facing the reed, a height which is aproximately equal to half the total height of the said side, so that the point of the beak which prolongs the said branch is approximately at equal distances from the sheets of warp threads and is close to the reed.

Experience has demonstrated that this form of construction offers the advantage of separating the floating threads from the reed at the precise place where the passage, formed by the two divided sheets of the warp, the reed and the point of weaving, afiords the maximum opening between the said divided sheets and at the same time the maximum distance from the fell of the cloth, the advantage of this division at the reed increasing in inverse ratio to the travel of the sley and to the degree of opening of the sheets, seeing that the fact must not be lost sight of that frequently it is a question of shuttles of very small dimensions and consequently with reduced shed and with a sley stroke travel which is also reduced.

In the same way the third form of construction described in the said application is characterized by the fact that the end of the branch which terminates in the form of a beak not only has an outer bevelling but also a bevelling on the inner opposite face, the end of the other branch also having outer and inner bevellings.

Experience has demonstrated that this form of construction offers the advantage of protecting the slot particularly well but of dividing the floating threads at a relatively great distance from the reed.

Owing to the combination of the advantages of the forms of construction above referred to,

that having an inclination equal to the weft thread at the'time of its presentation, said weft thread penetrates more easily into the slot as the sort of barring up effect resulting from the .particular conformation of the ends of the branches at the starting point of the slot need no longer be so pronounced, accordingly, in this new form of construction, the primary point formed by the end of that one of the branches against the reed being prolonged, as in the second form of construction, the warp thread-in the most unfavourable circumstances-passes round this point close to the reed and therefore at a definitely greater distance from the secondary point formed by the end' of the other branch, and consequently at a more acute angle in relation to the starting point of the slot.

Finally, this new form of construction oifers the advantages:- of allowing of a slighter inclination of the weft thread which, among other things, gives a narrower selvedge; of improving the sliding of the warp threads along the sides of the weft-inserter, and of ensuring a better guiding of the weft-inserter in the shed.

The invention is described hereafter and shown by way of an example in the attached drawing, in which:

Figure 1 is a partial plan view of the pirnless weft-inserter or weft-feeder, before its entry into the shed, at the moment preceding the catching of the weft thread;

Figure 2 is a partial plan view of the opposite side of the weft-'inserter as in Figure 1;

Figure 3 is a side view of the weft-inserter, showing the face which is presented to the reed;

Figure 4 is a side view of the back of the weft-inserter showing the face which is presented to the fell of the cloth;

Figure 5 is an end elevation of the extremity of the weft-inserter shown in Figure 3;

Figure 6 being a transverse sectional elevation of Figure 3 on the line AA.

Figure 6a is a plan view of the cutting blade I I.

Figure 6b is a section along the line 3-3 of Figure 4.

In that which concerns this new form of arrangement of the ends of the shuttles or weftfeeders, and as in the previous forms of construction, the weft-inserter consists of a body I of trapezoidal cross-section of which 2 and 3 are the faces intended to come into contact with the sheets of the warp threads forming the shed. 4 being the small side intended to face the fell of the cloth 6 and the large side intended to face the reed 1.

One of the ends (or, in accordance with circumstances, each of the ends) of this weft-inserter is split for a certain distance at I in the direction of its width, so asto divide the body I into two branches 9 and H), the bottom of the slot thus obtained having a cutting blade I I, detachable or not, which is intended to cut the weft thread, said cutting blade being arranged on a bias and issuing from a stripping orifi a ll arranged across one of the sides, said orifice at the same time-compelling the weft thread to engage with the blade which facilitates the cutting of the thread.

The blade is mounted in the weft-inserter and fixed by a nut lid in such manner that when the portion Nb of the blade is worn out the blade can be conveniently removed and replaced by a new one. Figure 6a shows the blade in an enlargement of five to one. Figure 6!: illustrates the position of the blade II in the weft-inserter. The thread I! is shown as passing around blade I I and as projecting in the form of a loop through the orifice ll. Due to this arrangement the thread is out quickly and effectively.

The large side' 5 has a wide groove I2 in which is accommodated the weft retaining clamp which can be constituted, either as in the other forms of construction in the U. S. application S. No.

695,996 mentioned above, or in the form of a single branch resting on the opposite side of the groove i2, shaped for this purpose, or again by blocks of springy material fitted with thin metal blades, said clamps being capable of taking one, two or a larger number of weft threads.

In that which concerns the improved arrangement according to the invention of one or of the two ends of the shuttle, for the purpose of keeping of! the floating or non-floating threads this arrangement is characterized by the fact that the longer branch 9 is prolonged beyond the shorter branch I, retaining for a certain distance its width and ending in a cant l3 which extends from the small side 4 to the large side 5 to form the point i4, close to the reed I, the outer face of this point presenting a trimmed, rounded or bevelled surface 3' merging into the fiat face 3 of the body I of the weft-inserter, whilst the inner face of the same point offers, as regards the prolonged part of the groove l2, a sloping surface l2 (Figure 5), which, at the junction of the large side 5 with the cant l3, fixes the point ll approximately half way up the shed, said inclined inner surface l2 being prolonged towards the opposite face 2 in the direction of the small side 4, by means of a surface if sloping in the opposite direction which forms an additional thickness l5 intended to cover and protect the slot I. This additional thickness I5 is in the same plane as the face 2 from which it is separated by the prolongation 8' of the slot 8.

The additional thickness l5 extends to the cant I! by means of a rounded or bevelled surface IS, in order to facilitate, on the one hand, the deflecting of the floating threads and, on the other hand, the easy sliding of the weft thread and its guiding into the slot .l when it is presented suitably in well known way. The end of the short branch II is shaped in almost the same way as in the other forms of construction of the above mentioned U. S. application S. No. 695,996, in the respect that this end has its outer surface trimmed, rounded or bevelled at 2' and merges into the fiat surface 2 of the body I of the shuttle, the inner surface remaining flat and presenting a small cant 16, starting from the small side 4, to the slot 8, to form a point ll which is almost at the place where the additional thickness I5 is of maximum width, the edges of the cant l6 and of the point I! are bevelled, rounded or otherwise shaped with a view to facilitating the passage and the sliding of the weft thread under the point I! towards the slot 8.

It should be understood that, as in the other forms of construction in the above mentioned U. S. application S. No. 695,996 the weft thread I8 is stretched between'the point or extremityii of the fell of the cloth and the thread guiding eyelet IS (Figure 1).

The point of presentation can also be advanced beyond the point of the fell of the cloth by means of the device comprising a springy notched blade proposed in the said patent to which the present improvements relate.

,. The groove, like the slot can of course be sloped differently in relation to the middle plane of the weft-inserter or can be parallel to it, according to the size of the shuttle and the width available and it must be understood that if the groove (and in consequence the slot) is sloped, this is in order to give to the shuttle, with an equal width and depth of groove, particularly reduced dimensions.

It is to be understod that alterations, modifications and additions may be made,without departing from the spirit of the invention. For example, in the caseof the application of this new form of construction to the ends 'of the thread carrying needles forming the object of the U. S. application S. No. 725,885 the sheet metal overlap with the triangular notch can be combined with the branches of the conveying needle, so as to contribute to the actual formation of the point, whilst leaving a large opening for the entry of the pulling needle. I

What I claim is:

A weft-inserting device comprising a body having two ends, said ends having the shape of two pronged riders, one of the prongs of the rider extending beyond the other whilst retaining the same width, said body having a small side and a large side, said longer prong ending in a cant which extends from said small side to said large side, whereby a point is formed which is adapted to be situated close to the reed and approximately at an equal distance from the sheets, the outer face of said point presenting a trimmed surface joining the plane surface of said body, the inner face of said point presenting an inclined plane surface, said body having another surface which is inclined in the opposite direction and which forms an additional thickness, the first-mentioned inclined plane surface being prolonged to the opposite face in the direction of said small side by the last-mentioned surface, said body having another inclined plane joining the last-mentioned surface to the cant, the shorter prong of said body having a cant beginning at the small side of said body somewhat behind the end of said additional thickness, whereby a point is formed substantially at the place where said additional thickness has its maximum width.

RAYMOND DEWAS. 

